package com.google.android.apps.iosched.util;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.text.Html;
import android.text.SpannableString;
import android.text.SpannableStringBuilder;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.view.LayoutInflater;
import android.view.View;
import android.webkit.WebView;
import android.widget.TextView;

import com.google.android.apps.iosched.R;

/**
 * Created by Alex on 13-12-4.
 */
public class HelpUtils {

    public static void showAbout(FragmentActivity activity) {

        FragmentManager fm = activity.getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        Fragment prev = fm.findFragmentByTag("dialog_about");
        if(prev != null){
            ft.remove(prev);
        }
        ft.addToBackStack(null);
        new AboutDialog().show(ft,"dialog_about");

    }

    public static class AboutDialog extends DialogFragment{
        private static final String VERSION_UNAVAILABLE = "N/A";

        public AboutDialog(){

        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {

            PackageManager pm = getActivity().getPackageManager();
            String packageName = getActivity().getPackageName();

            String versionName;
            try {
                PackageInfo info = pm.getPackageInfo(packageName, 0);
                versionName = info.versionName;
            }catch (PackageManager.NameNotFoundException e){
                versionName = VERSION_UNAVAILABLE;
            }

            SpannableStringBuilder aboutBody = new SpannableStringBuilder();
            aboutBody.append(Html.fromHtml(getString(R.string.about_body,versionName)));

            SpannableString licensesLink = new SpannableString(getString(R.string.about_licenses));
            licensesLink.setSpan(new ClickableSpan() {
                @Override
                public void onClick(View view) {
                    HelpUtils.showOpenSourceLicenses(getActivity());
                }
            },0,licensesLink.length(),0);
            aboutBody.append("\n\n");
            aboutBody.append(licensesLink);

            SpannableString eulaLink = new SpannableString(getString(R.string.about_eula));
            eulaLink.setSpan(new ClickableSpan() {
                @Override
                public void onClick(View view) {
                    HelpUtils.showEula(getActivity());
                }
            },0,eulaLink.length(),0);
            aboutBody.append("\n\n");
            aboutBody.append(eulaLink);


            LayoutInflater layoutInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            TextView aboutBodyView = (TextView) layoutInflater.inflate(R.layout.dialog_about,null);
            aboutBodyView.setText(aboutBody);
            aboutBodyView.setMovementMethod(new LinkMovementMethod());

            return new AlertDialog.Builder(getActivity())
                    .setTitle(R.string.title_about)
                    .setView(aboutBodyView)
                    .setPositiveButton(R.string.ok,
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int whichButton) {
                                    dialog.dismiss();
                                }
                            }
                            ).create();

        }

    }


    public static void showOpenSourceLicenses(FragmentActivity activity){
        FragmentManager fm = activity.getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        Fragment prev = fm.findFragmentByTag("dialog_licenses");
        if (prev != null){
            ft.remove(prev);
        }
        ft.addToBackStack(null);
        new OpenSourceLicensesDialog().show(ft,"dialog_licenses");
    }

    public static class OpenSourceLicensesDialog extends DialogFragment{
        public OpenSourceLicensesDialog(){

        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {

            WebView webView = new WebView(getActivity());
            webView.loadUrl("file:///android_asset/licenses.html");

            return new AlertDialog.Builder(getActivity())
                    .setTitle(R.string.about_licenses)
                    .setView(webView)
                    .setPositiveButton(R.string.ok,
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int whichButton) {
                                    dialog.dismiss();
                                }
                            }
                    ).create();

        }
    }

    public static void showEula(FragmentActivity activity){
        FragmentManager fm = activity.getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        Fragment prev = fm.findFragmentByTag("dialog_eula");
        if (prev != null){
            ft.remove(prev);
        }
        ft.addToBackStack(null);
        new EulaDialog().show(ft,"dialog_eula");

    }

    public static class EulaDialog extends DialogFragment{
        public EulaDialog(){

        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {

            int padding = getResources().getDimensionPixelSize(R.dimen.content_padding_normal);

            TextView eulaTextView = new TextView(getActivity());
            eulaTextView.setText(Html.fromHtml(getString(R.string.eula_text)));
            eulaTextView.setMovementMethod(LinkMovementMethod.getInstance());
            eulaTextView.setPadding(padding,padding,padding,padding);

            return new AlertDialog.Builder(getActivity())
                    .setTitle(R.string.about_eula)
                    .setView(eulaTextView)
                    .setPositiveButton(R.string.ok,
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int whichButton) {
                                     dialog.dismiss();
                                }
                            }
                            ).create();

        }

    }

}
